单项选择题

Computer is ______ invention.

A． so an important
B． such an important
C． such important
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单项选择题
I don't like to read letters ______ in pencil.
A． to write
B． writing
C． written
单项选择题
Lucy knew nothing about it ______ her sister told her.
A． because
B． until
C． since
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